Second elementary symmetric function of the first n terms of (1, 3, 7, 15, 31, ...).
A203242
Second elementary symmetric function of the first n terms of (1, 3, 7, 15, 31, ...).
Terms
- a(0) =3a(1) =31a(2) =196a(3) =1002a(4) =4593a(5) =19833a(6) =82818a(7) =339340a(8) =1375639a(9) =5543331a(10) =22263216a(11) =89249214a(12) =357422541a(13) =1430607325a(14) =5724394990a(15) =22901773824a(16) =91616007699a(17) =366482904615
External references
- oeis: A203242